Template:Selected anniversaries/April 20: Difference between revisions

Revision as of 20:53, 19 April 2018

1548: Mathematician, astronomer, and alleged time-traveller Petrus Apianus publishes Cosmographicus furatis, his magisterial treatise on crimes against astronomical constants.
1653: Oliver Cromwell dissolves the Rump Parliament.
1790: Mathematician and detective Johann Friedrich Pfaff uses partial differential equations of the first order Pfaffian systems to track and erase the Forbidden Ratio.
1902: Pierre and Marie Curie refine radium chloride.
1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.
1945: Mathematician Georg Feigl dies. He worked on the foundations of geometry and topology, studying fixed point theorems for n-dimensional manifolds. Feigl was one of the initial authors of the Mathematisches Wörterbuch.
1960: Industrialist, public motivational speaker, and alleged crime boss Baron Zersetzung calls the upcoming Bay of Pigs Invasion "a rock-solid business investment which is certain to generate handsome returns for early investors."
1961: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.
1962: Traces of Clandestiphrine residue are detected at the Bay of Pigs, raising questions about CIA involvement with transdimensional drugs.
2018: Spectrographic analysis of Two Creatures 6 unexpectedly reveals previously unknown color.

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 ||Paul Moritz Cohn (d. 20 April 2006) was Astor Professor of Mathematics at University College London, 1986-9, and author of many textbooks on algebra. His work was mostly in the area of algebra, especially non-commutative rings. Pic.
+File:Two Creatures 6.jpg|link=Two Creatures 6 (nonfiction)|2018: Spectrographic analysis of ''[[Two Creatures 6 (nonfiction)|Two Creatures 6]]'' unexpectedly reveals previously unknown [[Color (nonfiction)|color]].
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